Vortex tube



FIG. 1 : Perspective

FIG. 2 : Front

FIG. 3 : Rear

FIG. 4 : Left

FIG. 5 : Right

FIG. 6 : Top; and,

FIG. 7 : Bottom.

In the figures, the broken lines are for the purpose of illustratingportions of the vortex tube that form no part of the claimed design.

CLAIM The ornamental design for a vortex tube, as shown and described.